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checking tab details / bar type for addon

08-11-2017, 09:50 AM

Hello i have an addon that is added for each relevant tab in a chart.

I manage and process each tab and to create the detail i need - which is all good.

What i want to determine ... in OnWindowCreated which is called on starting a new chart within here i process the tabs. What is recommended way to check the bartype for each tab being processed in a chart ..

for each tab being processed from MainTabControl i get the following ...

can i check this against the bar type of the current tab being processed.
Is this bar information available at this point?
eg ... the following but realise this is not the same as bartype .. and will only tell me if tick - minute etc .. i need to know if matches my bartype ideally ... i couldnt see BarsType in the available list here ..

_currentTabchartControl.BarsPeriod.GetType

What i would like to do is only process the tab in the iteration if it matches my custom bar type and ignore/not process any other bar type.

In the OnWindowCreated called from an addon .. i would like to confirm what is available to reliably check for ... ie Bars .. Indicators loaded on the chart ?

I would suggest to look for BarsPeriod.BarsPeriodTypeName to identify the custom BarType.

Some ways you could get this would be through looping through the ChartObjects to get the ChartBars and then to reference the Bars object of ChartBars to then get the BarsPeriod and then the BarsPeriodTypeName.

We don't have any documentation that will tell you what is reliable to be accessed on a window creation. To reference something reliably, it is suggested to follow the State system.

You could also write the BarType and other AddOn's/Indicators/Strategies so they can share data in an AddOn with static variables to work around this. I will provide a link to the NT8 MyShared Methods example for the thread's reference.

So checking on the bar type .. doesnt seem available - hence my question to you in the original message. Is there a way to get an indication once a Tab is loaded by Ninja in the addon - i do register for this in the addon once the window is created but this is for new tabs added after the initialisation - so i know when to process a new tab after startup. Is there a way to know this on startup in a similar way - that way i could wait before i load my Xaml for the addon and set various properties

The code demonstrated above uses many undocumented components, and as such the amount of support we can provide will be very limited.

EDIT 2/16/2018: NOTE! BarsPeriodTypeName is deprecated. It would then be advised to use the index for your custom bartype and cast it with BarsPeriodType when adding a custom bar type. Detecting chart tabs with a certain BarType by name can be done by following the example above.

Comment

Hello, i just got that very annoying ninja message on submission and timing and lost all my text,

briefly i got it working but it does not work in the way you proposed. It was along the lines of what i had already coded.

The _currentTabchartControl.BarsPeriod.BarsPeriodTypeN ame.ToString().Equals("MyCustomBarType")

is available and i am able to filter out the tabs i want.

The PrimaryBars is not available and tests as null

Im not sure if you have tested what you proposed or was just sample code, the onwindowCreated seems to be called after all the ninjatrader initialisation - so for now i am testing this more but wondering why this is available and the other information ie Bars is not - all i need is the BarsPeriod to make my check - so if this is reliable then i am good as far as this goes for now

As I mentioned in my initial reply, we don't have any documentation that will tell you what is reliable to be accessed on a window creation. You may find something that works, but we only recommend using the State system for reliable references. This is why I tested in the AddOn's constructor to loop through all charts and tabs to find the custom BarsType.

Of course, further code will have to be implemented to track what you are doing after you detect your BarsType and make changes in the AddOn window.

Since OnWindowCreated() would not guarantee a valid reference, we could submit a feature request for a method that gets called when a new tab is created (and ready.) Other than that, I would suggest to devise a solution based on looping through the Charts and tabs.

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